JPWO2003005708A1 - Broadcast system - Google Patents

Abstract

The broadcasting system BS includes a broadcasting device 1 and a receiving device 2. The broadcasting device 1 receives and stores the proxy request PR including the identifier of the receiving device 2 and the command to be transmitted. Then, a command packet is assembled from a set of the stored identifier and the command, a stream in which the packet is multiplexed is created, and transmitted to a broadcast channel. The receiving device 2 separates the command packet from the stream and restores the set of the identifier and the command. Then, based on the identifier of the own device stored in advance and the decomposed identifier, it is determined whether or not the decomposed command is addressed to the own device. If the command is addressed to the own device, the command is stored internally. And then run.

Description

Technical field
The present invention relates to a broadcasting system, and more particularly, to a broadcasting system in which a broadcasting device transmits a command for a device to be controlled in a broadcasting format to a receiving device.
Background art
FIG. 26 is a block diagram showing the overall configuration of a conventional broadcasting system. The broadcasting system of FIG. 26 is disclosed in JP-A-10-155131, and includes a communication terminal device TA1, a server BSV as the broadcasting device, a communication terminal device TA2 as the receiving device, and a control target device. And a video tape recorder VTR. The communication terminal device TA1 transmits information called a recording reservation request to a server BSV communicably connected via the Internet INT. In response to the recording reservation request sent from the communication terminal device TA1, the server BSV superimposes the personal reservation recording information as an example of the above command on the teletext channel CH and transmits it to the communication terminal device TA2. The communication terminal device TA2 has a function of receiving programs for television broadcasting and teletext broadcasting, receives a video signal transmitted using a normal broadcasting channel, and is connected to a video tape recorder VTR communicable with itself. To supply the received signal. Further, the communication terminal device TA2 sets the recording reservation requested by the communication terminal device TA1 to the video tape recorder VTR according to the personal reservation recording information transmitted from the server BSV using the teletext channel CH.
Next, technical problems of the conventional broadcasting system will be described.
First, the above publication discloses only one communication terminal device TA2, but an actual broadcast system accommodates many communication terminal devices TA2. Nevertheless, since the server BSV simply multiplexes the personal reservation recording information that has arrived at the server BSV and sends it to the teletext channel CH, each communication terminal TA2 is transmitted to the other communication terminal TA2. Personal reservation recording information may be received. Furthermore, since there are also a plurality of servers BSV, different teletext channels CH are assigned to each of them. In addition, the communication terminal device TA2 receives the personal reservation recording information transmitted using the channel CH specified by the user from the plurality of teletext channels CH. Therefore, in order to reliably perform scheduled recording, the communication terminal device TA2 must be set to the teletext channel CH used by the server BSV when the personal scheduled recording information from the server BSV arrives at the communication terminal device TA2. . Therefore, when the correct teletext channel CH is not selected, the communication terminal device TA2 cannot receive the individual reservation recording information from the server BSV, and cannot perform the reservation recording. As can be understood from the above, the conventional broadcasting system has a first problem that the receiving apparatus is likely to be unable to correctly receive only the command addressed to itself.
Next, the above-mentioned publication discloses only one communication terminal device TA1 as in the case of the communication terminal device TA2, but in an actual broadcasting system, the server BSV includes personal information from a large number of communication terminal devices TA1. Scheduled recording information arrives. Here, due to the nature of scheduled recording, the personal scheduled recording information must reach the communication terminal device TA2 by the time the program requested by the communication terminal device TA1 starts. However, since the conventional server BSV merely sends the arrived personal reservation recording information, the personal reservation recording information may not have arrived at the communication terminal device TA2 before the start of the program to be reserved and recorded. There was a second problem.
Therefore, a first object of the present invention is to provide a broadcasting system with a higher degree of certainty that a receiving device can receive only a command addressed to itself. A second object of the present invention is to provide a broadcasting system in which a command sent from a broadcasting device arrives at a receiving device by a predetermined time.
Disclosure of the invention
The present invention achieves the first and second objects by the following aspects. A first aspect is a broadcast system including a transmission device and a reception device, wherein the broadcast device receives a proxy request including at least an identifier assigned to the reception device and a command to be transmitted to the reception device. A request receiving unit, a proxy request storage device for storing the proxy request received by the request receiving unit, and a command for extracting a set of an identifier of the receiving device and a command to the receiving device from the proxy request stored in the proxy request storage device A fetch unit, a command packet assembler for assembling a command packet from a set of identifiers and commands fetched by the command fetch unit, and a multiplexer for creating a stream in which the command packets assembled by the command packet assembler are multiplexed. And a transmitter for transmitting the stream created by the multiplexer to a broadcast channel. Also, the receiving device separates the command packet from the stream transmitted to the broadcast channel by the transmitter, and the command packet separated by the command packet separating unit. A command packet decomposing unit for restoring the set, a device identifier storing unit for storing an identifier of the own device, an identifier of the receiving device decomposed by the command packet decomposing unit, and an identifier of the own device stored in the device identifier storing unit A command filtering unit that determines whether the command decomposed by the command packet decomposing unit is addressed to the own device, a command storage unit that stores the command determined to be addressed to the own device by the command filtering unit, Command execution unit that executes commands stored in the command storage unit Equipped with a.
Further, a second aspect is a broadcasting device for broadcasting a stream to a receiving device, wherein the request receiving unit receives a proxy request including at least an identifier assigned to the receiving device and a command to be transmitted to the receiving device. A proxy request storage device that stores the proxy request received by the request receiving unit, and a command extraction unit that extracts a set of an identifier of the receiving device and a command to the receiving device from the proxy request stored in the proxy request storage device. A command packet assembler for assembling a command packet from a set of an identifier and a command extracted by the command extracting unit, a multiplexer for creating a stream in which the command packets assembled by the command packet assembler are multiplexed, And a transmitter for transmitting a stream created by the device to a broadcast channel. Here, the command extracting unit extracts a set of the identifier of the receiving device and the command to the receiving device a plurality of times from the same proxy request.
A third aspect is a receiving device for receiving a stream from a broadcasting device, wherein the broadcasting device multiplexes a command packet assembled from an identifier assigned to the receiving device and a command to be transmitted to the receiving device. The stream is broadcast using a pre-allocated broadcast channel, a tuner unit that receives a stream sent through the broadcast channel, a device identifier storage unit that stores an identifier of its own device, and a tuner unit The command filtering unit that determines whether the identifier multiplexed in the received stream matches the identifier of the own device stored in the device identifier storage unit, and the command filtering unit determines that both identifiers match. The command multiplexed in the stream received by the tuner unit. It includes a command storage unit, and a command execution unit for executing commands stored in the command storage unit.
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a schematic diagram illustrating an overall configuration of a broadcasting system BS according to an embodiment of the present invention. The broadcasting system BS in FIG. 1 includes a broadcasting device 1 owned by a broadcasting company, a receiving device 2 and a communication terminal device 3 each owned by a user, and a communication line 4. In brief, the broadcasting device 1 receives the proxy request PR sent from the communication terminal device 3 through the communication line 4 and stores it therein. The proxy request PR includes a command Cct transmitted to the receiving device 2, and is information for the communication terminal device 3 to request the broadcast device 1 to perform transmission of the command Cct. In the present embodiment, as an example, the command Cct is a program scheduled to be broadcast using a broadcast channel BCH allocated to the broadcast apparatus 1 between a predetermined broadcast start time Tst and a broadcast end time Tnd (hereinafter, broadcast CTS). (Referred to as a program).
FIG. 2A is a schematic diagram illustrating an example of the data structure of the above-described proxy request PR. In FIG. 2A, the proxy request PR includes a device identifier IDrt, a password PW, and a command Cct. The device identifier IDrt is an identifier assigned to the receiving device 2 in advance, and typically includes a sequence of numbers. The password PW is composed of a string of characters or symbols that the user likes, or a combination of characters and symbols. The command Cct includes a reserved recording command Crec, a broadcast channel BCH used for transmitting a broadcast program to be reserved for recording, a broadcast start time Tst and a broadcast end time Tnd of the broadcast program. Here, in the following description, a broadcast program to be reserved and recorded is referred to as a reserved broadcast program. The broadcast start time Tst and the broadcast end time Tnd also include information indicating a month and a day. FIG. 2B is a schematic diagram showing a specific example of the proxy request PR shown in FIG. In FIG. 2 (b), 211.155.5.1.1 as the device identifier IDrt, NAISHO as the password PW, 8 as the broadcast channel BCH, 19:00 on June 21 as the broadcast start time Tst, Furthermore, 20:00 on June 21 is set as the broadcast end time Tnd.
The broadcast device 1 of FIG. 1 multiplexes a proxy request PR stored therein and video data Dv and audio data Da stored therein in advance to form a transport stream (hereinafter simply referred to as a stream) TS. create. The broadcasting device 1 transmits the created stream TS to the receiving device 2 using the broadcast channel BCH. Further, the broadcasting device 1 may receive a proxy request PR that cannot be received. Typically, such a proxy request PR arrives at the broadcasting device 1 later than a reference time Tref described later. The broadcast device 1 discards such a proxy request PR, and further creates a request rejection RR, which is information indicating that the proxy request PR has not been accepted, and sends it to the communication line 4. Further, when the proxy request PR is received, the broadcasting device 1 transmits a reception completion RC, which is information indicating that, to the communication terminal device 3 via the communication line 4.
FIG. 3 is a block diagram showing a detailed configuration of the broadcasting device 1 as described above. 3, the broadcasting device 1 includes a request receiving unit 11, a timer 12, a request determining unit 13, a request discarding unit 14, a request rejection creating unit 15, a request rejecting transmitting unit 16, a request writing unit 17, Request storage device 18, reception completion creation unit 19, reception completion transmission unit 110, command extraction unit 111, command packet assembler 112, broadcast program storage device 113, video encoder 114, video packet It comprises an assembler 115, an audio encoder 116, an audio packet assembler 117, a multiplexer 118, and a TS transmitter 119.
The request receiving unit 11 receives the proxy request PR sent from the communication terminal device 3 through the communication line 4 and passes it to the request determining unit 13. The timer 12 measures the current time Tcr, and returns the current time Tcr to the request determination unit 13 in response to the request from the request determination unit 13. The request determining unit 13 requests the timer 12 to send the current time Tcr every time the proxy request PR is received from the request receiving unit 11. Further, the request determination unit 13 determines whether or not to accept the currently received proxy request PR based on the current time Tcr received from the timer 12. More specifically, the request determination unit 13 determines whether the received current time Tcr is later than a reference time Tref described later. If the current time Tcr is later than the reference time Tref, the request determination unit 13 determines that the proxy request PR is not accepted, and passes the proxy request PRd to the request discarding unit 14 as a proxy request PRd. The request discarding unit 14 discards the received proxy request PRd, and passes a request rejection RR creation instruction ISrr to the request rejection creation unit 15. The request rejection creation unit 15 creates a request rejection RR in response to receiving the creation instruction ISrr, and passes it to the request rejection transmission unit 16. The request rejection transmission unit 16 sends the received request rejection RR to the communication line 4.
If the request determination unit 13 determines that the current time Tcr is equal to or earlier than the reference time Tref, the request determination unit 13 accepts the current proxy request PR and uses it as a proxy request PRp. Pass to. The request writing unit 17 writes the received proxy request PRp in the request storage device 18, and further passes a reception completion RC creation instruction ISrc to the reception completion creation unit 19. The reception completion creating unit 19 creates a reception completion RC in response to the creation instruction ISrc, and passes it to the reception completion transmitting unit 110. The reception completion transmitting unit 110 sends the received reception completion RC to the communication line 4.
Further, the command fetching unit 111 periodically selects a predetermined number of Nmux proxy requests PRp from the request storage device 18 and sets the device identifier IDrt, the password PW and the command Cct in the information set from the selected Nmux proxy requests PRp. It is periodically selected and read as Icom. Here, in the broadcasting system BS, the bandwidth BWct is predetermined in order to transmit the command packet Pct assembled by the command packet assembler 112. Nmux is a natural number of 1 or more, and is set in advance to an appropriate value according to the bandwidth BWct. Nmux is also the number of commands Cct multiplexed to the stream TS each time the multiplexer 118 performs step S33 (see FIG. 16) once. The command extracting unit 111 transfers all of the read information set Icom to the command packet assembler 112. The command packet assembler 112 assembles one command packet Pct for one information set Icom. Further, the command packet assembler 112 assembles one header packet Phd so that the receiving device 2 can accurately separate the command packet Pct. When the above packet assembling is completed, the command packet assembler 112 outputs them to the multiplexer 118 in the order of the header packet Phd and the command packet Pct.
Here, FIG. 4A is a schematic diagram illustrating an example of a series of header packets Phd and command packets Pct output from the command packet assembler 112, and FIG. FIG. 3 is a schematic diagram showing a specific example of a series of header packets Phd and command packets Pct output from a command packet assembler 112 when a proxy request PR shown in FIG. 2B is selected as an information set Icom.
The broadcast program storage device 113 typically stores a plurality of sets of video data Dv and audio data Da. Each set of the video data Dv and the audio data Da represents one program. The video data Dv and the audio data Da as described above are read from the broadcast program storage device 113 at the broadcast start time Tst of the program constituted by them and output to the video encoder 114 and the audio encoder 116. Is done. The video encoder 114 encodes the input video data Dv according to a predetermined video encoding scheme, and creates encoded video data Dcv. The video encoder 114 outputs the generated video data Dcv to the video packet assembler 115. The video packet assembler 115 assembles a video packet Pcv from the input video data Dcv, and outputs the video packet Pcv to the multiplexer 118. Further, the audio encoder 116 encodes the output audio data Da of the broadcast program storage device 113 according to a predetermined audio encoding method, and creates encoded audio data Dca. The voice encoder 116 outputs the generated voice data Dca to the voice packet assembler 117. The audio packet assembler 117 assembles the audio packet Pca from the input audio data Dca and outputs the audio packet Pca to the multiplexer 118. Here, in the broadcasting system BS, a bandwidth BWav is predetermined in order to transmit the video packet Pcv and the audio packet Pca. The video encoder 114 and the audio encoder 116 perform their own encoding processes according to the bandwidth BWav.
The multiplexer 118 multiplexes the video packet Pcv from the video packet assembler 115, the audio packet Pca from the audio packet assembler 117, the header packet Phd and the command packet Pct from the command packet assembler 112, and multiplexes the stream. Create TS. The multiplexer 118 outputs the created stream TS to the TS transmitter 119. The TS transmitter 119 sends the input stream TS to the broadcast channel BCH.
Here, FIG. 5A is a schematic diagram illustrating an example of a stream TS transmitted from the TS transmitter 119, and FIG. 5B is a diagram illustrated in FIG. 4B by the command packet assembler 112. FIG. 9 is a schematic diagram showing a configuration of a stream TS output from a multiplexer 118 when a command packet Pct is output.
1 is a set-top box that is typically installed indoors, and receives a stream TS transmitted using a broadcast channel BCH. As a characteristic process of the present embodiment, the receiving device 2 separates the command Cct addressed to itself multiplexed on the received stream TS and stores it in the internal command storage unit 211 (see FIG. 6). Further, the receiving device 2 executes the scheduled recording from the broadcast start time Tst specified by the stored command Cct to the broadcast end time Tnd. In the following description, a period from the broadcast start time Tst to the broadcast end time Tnd is referred to as a reserved time zone TPrp. By executing the reserved recording, the receiving apparatus 2 separates the video packet Pcv and the audio packet Pca constituting the reserved broadcast program from the received stream TS during the reserved time slot TPrp, and stores the reserved program storage device 218 (FIG. Reference). If the command Cct cannot be stored in the command storage unit 211 for some reason, the receiving device 2 creates an error message EM for notifying the communication terminal device 3 of the fact and sends it to the communication line 4. I do.
FIG. 6 is a block diagram showing a detailed configuration of the receiving device 2 as described above. 6, the receiving device 2 includes a power source 21, a designated channel storage unit 22, a power state monitoring device 23, a tuner 24, a command packet separating unit 25, a command packet decomposing unit 26, and a device identifier storing unit 27. A password storage unit 28, a command filtering unit 29, a determination / write unit 210, a command storage unit 211, an address storage unit 212, an error message creation unit 213, a line connection unit 214, a timer 215, It includes a command execution unit 216, an AV packet separation unit 217, a reserved program storage device 218, and a free space detection unit 219.
The power supply 21 is typically set to three states: on, off, and standby by operating a switch (not shown) of the receiving device 2 by a user. In this embodiment, when the power supply 21 is turned on, the power supply 21 supplies a drive voltage to all the components (designated channel storage unit 22 to free space detection unit 219) shown in FIG. FIG. 6 shows only the drive voltage Ecc to the AV packet separation unit 217 for convenience. Further, the power supply 21 supplies a drive voltage to at least the configuration excluding the AV packet separation unit 217 in the standby state. Since this is irrelevant in the present embodiment, the description when the power supply 21 is off is omitted.
The designated channel storage unit 22 stores information indicating the broadcast channel BCH designated by the user. In the following description, what is stored in the designated channel storage unit 22 is referred to as designated broadcast channel BCHr. Hereinafter, the designated broadcast channel BCHr will be described in detail. In the present embodiment, the broadcaster uses the broadcasting device 1 of FIG. 1 to provide another service of transmitting the command Cct to the receiving device 2 in addition to the program broadcasting service (hereinafter, referred to as a proxy service). I will provide a. The designated broadcast channel BCHr is a broadcast channel BCH assigned to the broadcaster to whom the user has contracted to receive the substitute service.
Typically, the power supply state monitoring device 23 detects a point in time when the power supply 21 transitions from on to a standby state, and after detecting this transition, generates a control signal CSfa and outputs it to the tuner 24. Control signal CSfa is a signal for instructing to set the reception frequency band of tuner 24 to designated broadcast channel BCHr.
When the power supply 21 is turned on, the tuner 24 sets the reception frequency band to the broadcast channel BCH specified by the user using an input device (not shown). In addition, in response to receiving the control signal CSfa from the power supply state monitoring device 23, the tuner 24 extracts the designated broadcast channel BCHr from the designated channel storage unit 22, and sets the reception frequency band to the extracted broadcast channel BCHr. In addition, in response to receiving the control signal CSfb from the command execution unit 216, the tuner 24 sets a reception frequency band on the broadcast channel BCH designated thereby. Here, the control signal CSfb is a signal for instructing to set the reception frequency band of the tuner 24 to the broadcast channel BCH notified by the command execution unit 216 in order to execute the scheduled recording. The tuner 24 receives the stream TS transmitted using the set broadcast channel BCH, and outputs the received stream TS to the command packet separation unit 25 and the AV packet separation unit 217.
The command packet separating unit 25 separates each command packet Pct multiplexed in the input stream TS (see FIGS. 5A and 5B) according to the header packet Phd multiplexed before the command packet Pct. The packet is passed to the packet decomposing unit 26. The command packet decomposing unit 26 decomposes the received command packet Pct and restores the information set Icom. The command packet decomposing unit 26 passes the restored information set Icom to the command filtering unit 29.
The device identifier storage unit 27 and the password storage unit 28 store the device identifier IDrt and the password PW described above. In the following description, those stored in the device identifier storage device 26 and the password storage unit 28 are referred to as a local device identifier IDrt and a local password PW. Using both the local device identifier IDrt and the local password PW stored in the device identifier storage device 26 and the password storage unit 28, the command filtering unit 29 performs filtering processing on the information set Icom received from the command packet decomposing unit 26. I do. More specifically, the command filtering unit 29 determines that the local device identifier IDrt and the local password PW exactly match the device identifier IDrt and the password PW included in the information set Icom, and Judge as the information set Icom. In the present embodiment, the appropriate information set Icom means a command packet Pct created from the proxy request PRr created according to the user's intention and addressed to the own device. That is, it is considered that the information set Icom whose device identifier IDrt does not match is not addressed to the own device, and the information set Icom whose password PW does not match is not generated by the user operating the communication terminal device 3. Will be considered. When determining that the information set Icom received this time is appropriate, the command filtering unit 29 extracts the command Cct from the information set Icom and passes it to the determination / write unit 210. Conversely, if it is determined that the information set is an inappropriate information set Icom, the command filtering unit 29 discards it.
The determination / write unit 210 determines whether to write the received command Cct into the command storage unit 211. As shown in FIGS. 2A and 2B, the command Cct includes a broadcast start time Tst and a broadcast end time Tnd. The command storage unit 211 stores several commands Cct written by the determination / write unit 210. From the above, in order to perform the scheduled recording correctly, two commands Cct having the mutually overlapping reserved time zones TPrp must not be stored. For example, as shown in FIG. 7, a command Cct including 18:30 on June 21 as the broadcast start time Tst and 19:30 on the same day as the broadcast end time Tnd is already stored in the command storage unit 211. Assume the case. In such a case, the command Cct set in the proxy request PR shown in FIG. 2B must not be stored in the command storage unit 211. This is because the time from 19:00 to 19:30 on June 21 overlaps with both commands Cct. In view of the above, the determination / writing unit 210 extracts the reserved time period TPrp from the received information set Icom, and determines whether or not the reserved time period TPrp overlapping the extracted reserved time period TPrp is stored in the command storage unit 211. Judge. In the following description, this determination processing is referred to as overlap reservation determination processing.
The reserved program storage device 218 stores the video packet Pcv and the audio packet Pca in a storage area having a finite capacity. Therefore, in order to perform the scheduled recording correctly, it is necessary that a sufficient free area FS for storing the reserved broadcast program specified by the command Cct remains in the reserved program storage device 218. From the above viewpoint, the free space detecting unit 219 detects the free space FS of the reserved program storage device 218 in response to the request from the determining / writing unit 210, and returns the detected one to the determining / writing unit 210. The determination / write unit 210 estimates the capacity SS required for storing the reserved broadcast program from the reserved time zone TPrp in the received information set Icom. The determination / writing unit 210 determines whether or not the estimated capacity SS exceeds the free capacity FS from the free capacity detection unit 219. Hereinafter, this determination processing is referred to as capacity determination processing.
The determination / write unit 210 performs the overlap reservation determination process and the capacity determination process on the received command Cct, and when both the determination results are No, authorizes the writing of the command Cct and writes it to the command storage unit 211 as the command ACct. If at least one of the determination results is Yes, the determination / write unit 210 discards the received command Cct without storing it in the command storage unit 211, and further outputs an error message EM creation instruction ISem to the error message creation unit. 213.
The command storage unit 211 is composed of a nonvolatile storage device, and stores the command ACct as is clear from the above. The address storage unit 212 stores the address Act specified by the user. The address Act is an address for uniquely specifying the communication terminal device 3, and typically includes a string of characters or numbers. In the present embodiment, the address Act is set to address @ pop. ne. jp. The error message creation unit 213 extracts the address Act from the address storage unit 212 in response to the creation instruction ISem, and creates the error message EM. The error message creation unit 213 passes the created error message EM to the line connection unit 214. After connecting to the communication line 4 in response to the arrival of the error message EM, the line connection unit 214 sends the received error message EM to the communication line 4.
FIG. 8 is a schematic diagram showing an example of the data structure of the error message EM created by the error message creation unit 213. 8, the error message EM is illustratively composed of an electronic mail, and includes at least an address Act and a text MT indicating that the command Cct could not be written in the command storage unit 211.
The timer 215 measures the current time Tcr, and passes the current time Tcr to the command execution unit 216 at predetermined time intervals. The command execution unit 216 accesses the command storage unit 211 every time the current time Tcr arrives from the timer 215. Then, the command execution unit 216 searches all commands Cct in the command storage unit 211 for a broadcast start time Tst that matches the received current time Tcr. In the following description, the command Cct that satisfies this condition is referred to as an execution command ECct. When the command execution unit 216 can find the execution command ECct, it starts executing the command ECct. More specifically, first, the command execution unit 216 generates a control signal CSon for instructing the power supply 21 to be turned on, and outputs the control signal Cson to the power supply 21. The power supply 21 supplies the drive voltage Ecc to the AV packet separation unit 217 in response to the input control signal CCon. The command execution unit 216 extracts the broadcast channel BCH of the reserved broadcast program from the execution command ECct, generates a control signal CSfb including the extracted broadcast channel BCH, and outputs the control signal CSfb to the tuner 24. As described above, the tuner 24 sets the reception frequency band to the broadcast channel BCH specified by the input control signal CSfb, and receives the stream TS. Further, the command execution unit 216 creates a recording instruction ISrec for instructing the AV packet separation unit 217 to store the video packet Pcv and the audio packet Pca separated from the received stream TS in the reserved program storage device 218. The command execution unit 216 outputs the created recording instruction ISrec to the AV packet separation unit 217. The AV packet separation unit 217 performs the operation as instructed by the recording instruction ISrec. As a result, the reserved video program storage device 218 starts to store the video packet Pcv and the audio packet Pca separated by the AV packet separation unit 217. That is, recording of the reserved broadcast program starts. Further, when recognizing that the broadcast end time Tnd of the execution command ECct matches the current time Tcr received from the timer 215, the command execution unit 216 ends the execution of the command ECct. More specifically, the command execution unit 216 generates a control signal CSsb for instructing the power supply 21 to be set to the standby state, and outputs the control signal CSsb to the power supply 21. The power supply 21 transitions to the standby state in response to the input control signal CSsb, and stops supplying the drive voltage Ecc to the AV packet separation unit 217. As a result, the recording of the reserved broadcast program ends. Further, since the power supply 21 is in the standby state, the power supply state monitoring device 23 generates the above-described control signal CSfa and transmits it to the tuner 24.
The communication terminal device 3 in FIG. 1 is preferably a mobile phone, and creates the above-mentioned proxy request PR according to a user's operation and sends it out to the wireless channel WCH. The transmitted proxy request PR is received by the base station on the communication line 4 via the wireless channel WCH, and then transmitted to the broadcasting device 1. Further, the base station on the communication line 4 sends out a request rejection RR or a reception completion RC from the broadcasting device 1 or an error message EM from the receiving device 2 on the wireless channel WCH. The communication terminal device 3 receives the request rejection RR, the reception completion RC, or the error message EM from the wireless channel WCH, and the broadcast device 1 has not received or has received the command Cct, or the reception device 2 has received the command Cct. Outputs an image or sound indicating that cannot be executed.
FIG. 9 is a block diagram showing a detailed configuration of the communication terminal device 3 as described above. 9, the communication terminal device 3 includes an input device 31, an application execution unit 32, a device identifier storage unit 33, a password storage unit 34, a wireless transmission / reception unit 35, and an output device 36 including a display device or a speaker. And a target identifier storage unit 37.
Input device 31 typically comprises a keyboard. The user operates the input device 31 to input information necessary for data communication of the broadcasting system BS. Although not shown in FIG. 9 for convenience, the input information includes the device identifier IDrt and the password PW, the broadcast channel BCH, the broadcast start time Tst, and the broadcast end time Tnd. These pieces of input information are sent to the application execution unit 32. The application execution unit 32 includes a processor, a ROM (Read Only Memory) and a RAM (Random Access Memory), and stores a computer program (hereinafter, referred to as a proxy request program) 321 for a proxy request and a mail processing program 322 in the ROM. ing. The application execution unit 32 executes the proxy request program 321 to create the above-described proxy request PR, and receives the above-described request rejection RR or reception completion RC. Further, the application execution unit 32 executes the mail processing program 322 to receive the error message EM. The device identifier storage unit 33 and the password storage unit 34 store the device identifier IDrt and the password PW sent from the application execution unit 32. The wireless transmission / reception unit 35 performs a predetermined modulation process or a multiplexing process on the proxy request PR received from the application execution unit 32, and then transmits the proxy request PR to the wireless channel WCH. In addition, after performing predetermined demodulation processing and separation processing on the request rejection RR, the reception completion RC, or the error message EM received from the wireless channel WCH, the wireless transmission / reception unit 35 sends them to the application execution unit 32. hand over. Note that the target identifier storage unit 37 is a configuration that is required in a second modified example described later, and thus the description thereof is omitted here.
Next, items set before data communication of the broadcasting system BS will be described. The user operates the input device 31 of the communication terminal device 3, specifies the proxy request program 321, and starts the application execution unit 32. Thereafter, the user operates the input device 31 to input the device identifier IDrt. The application execution unit 32 stores the input device identifier IDrt in the device identifier storage unit 33. Further, the user operates the input device 31 to input the password PW. The application execution unit 32 stores the input password PW in the password storage unit 34. Further, the user operates an input device (not shown) of the receiving device 2 to input the same password PW stored in the password storage unit 34, and further inputs the address Act. As a result of the above input, the input is stored in the device identifier storage unit 27 of the receiving device 2 as the local password PW. The address storage unit 212 stores the input address Act. Note that the same device identifier IDrt set in the device identifier storage unit 33 is stored in the device identifier storage unit 27 of FIG. 6 as a local device identifier IDrt, for example, at the time of factory shipment. Further, the user enters into a contract for receiving a substitute service from the broadcaster. After the contract, the user or the broadcasting company operates the input device (not shown) of the receiving device 2 of the user to input the broadcasting channel BCH used by the contracted broadcasting company as the designated broadcasting channel BCHr. The input designated broadcast channel BCHr is stored in the designated channel storage unit 22.
Next, data communication performed in the broadcasting system BS will be described in detail.
FIGS. 10A and 10B are sequence charts showing a procedure of data communication of the broadcasting system BS. When the user notices that he has forgotten to set the scheduled recording of the scheduled broadcast program on the go, he starts operating the communication terminal device 3. The user operates the input device 31 of the communication terminal device 3 to specify the proxy request program 321. In response to this designation, the application execution unit 32 starts executing the proxy request program 321. After the start of the execution, the application execution unit 32 creates a proxy request PR according to the input information of the user, and transmits the proxy request PR to the broadcasting device 1 through the communication line 4 (sequence Q11 in FIGS. 10A and 10B).
Here, FIG. 11 is a flowchart illustrating a processing procedure when the application executing unit 32 creates and transmits the proxy request PR. In FIG. 11, the application execution unit 32 generates image data that allows the user to specify items necessary for scheduled recording, and passes the image data to the output device 36. The output device 36 displays an image in which the user can designate necessary items for the scheduled recording according to the received image data (step S11 in FIG. 11).
FIG. 12A is a schematic diagram illustrating an example of an image displayed in step S11. As shown in FIG. 12 (a), on the screen of the output device 36, an input field Cbch of a broadcast channel BCH through which a reserved broadcast program is transmitted and a broadcast of the reserved broadcast program An image including an input column Cst of the start time Tst and an input column Cnd of the broadcast end time Tnd of the reserved broadcast program is displayed. The user operates the input device 31 to input the broadcast channel BCH, the broadcast start time Tst, and the broadcast end time Tnd into each of the input fields Cbch, Cst, and Cnd of the display image on the output device 36. It should be noted here that a plurality of broadcasting devices 1 are actually accommodated in the broadcasting system BS. Therefore, in the input field Cbch, not only the broadcast channel BCH of the broadcast device 1 shown in FIG. 1 but also the broadcast channel BCH of another broadcast device 1 (not shown) can be set. The broadcast start time Tst is a point that includes not only the time at which the broadcast of the reserved broadcast program starts but also the month and day. The same applies to the broadcast end time Tnd including the month and day. FIG. 12B is a schematic diagram showing an example of the broadcast channel BCH, the broadcast start time Tst, and the broadcast end time Tnd input to the input fields Cbch, Cst, and Cnd shown in FIG. In FIG. 12B, 8 is input in the input field Cbch, 19:00 on June 21 is input in the input field Cst, and 20:00 on June 21 is input in the input field Cnd.
The application execution unit 32 receives the broadcast channel BCH, the broadcast start time Tst, and the broadcast end time Tnd respectively input by the user (Step S12), and thereafter, creates a command Cct using the received information (Step S13). . Here, step S13 will be described in more detail. FIG. 13A is a schematic diagram illustrating a data format of a command Cct prepared in advance in the application execution unit 32. In FIG. 13A, the command Cct includes a scheduled recording command Crec and three fields in which a broadcast channel BCH, a broadcast start time Tst, and a broadcast end time Tnd are set. In step S13, the application execution unit 32 sets the broadcast channel BCH, the broadcast start time Tst, and the broadcast end time Tnd received in step S12 in the above three fields, and creates a command Cct. Here, FIG. 13B is a schematic diagram showing an example of the broadcast channel BCH, the broadcast start time Tst, and the broadcast end time Tnd set in the three fields shown in FIG. When the information as shown in FIG. 12B is input, as shown in FIG. 13B, three fields of the command Cct include 19:00 on August 21, June 21 and 19:00 on June 21. 20:00 is set.
After the completion of the creation of the command Cct, the application execution unit 32 sequentially extracts the password PW and the device identifier IDrt from the password storage unit 34 and the device identifier storage unit 33 (Steps S14 to S15). Next, the application execution unit 32 adds the extracted password PW and device identifier IDrt to the command Cct created in step S13, and assembles a proxy request PR (see FIG. 2A) (step S16). When the command Cct shown in FIG. 13B is created, the proxy request PR shown in FIG. 2B is created.
After creating the proxy request RR, the application execution unit 32 controls the wireless transmission / reception unit 35 to establish a connection with the broadcasting device 1 (Step S17). The establishment of the connection is not limited to after step S16, but may be performed before that. After the connection is established, the application execution unit 32 sends the proxy request PR created this time to the communication line 4 via the wireless transmission / reception unit 35 (Step S18). The proxy request PR transmitted as described above is transmitted to the broadcast device 1 through the communication line 4 of FIG. 1 as shown in FIGS. 10A and 10B.
FIG. 14 is a flowchart illustrating a processing procedure when the broadcast device 1 receives the proxy request PR. In FIG. 14, the request receiving unit 11 of the broadcasting device 1 is waiting for the arrival of the proxy request PR (step S21), and passes the received proxy request PR to the request determining unit 12. The request determination unit 12 determines whether or not to accept the current proxy request PR (Step S22). As described above, the proxy request PR including the command Cct that becomes useless even when transmitted to the receiving device 2 may arrive at the broadcasting device 1. A representative example of the useless command Cct is as described below. That is, the broadcast start time Tst set in the command Cct is the time at which the scheduled recording must be started. Therefore, the command Cct needs to arrive at the receiving device 2 at the latest by the broadcast start time Tst. Here, assuming that the time from when the command packet Pct including the command Cct is transmitted from the broadcasting device 1 to when the command packet Pct arrives at the receiving device 2 is Ttf1,
Ttf1 ≒ (Nmux × Sct + Shd) / BWct (1)
Can be approximated. Here, Nmux and BWct are as described above. Sct is the data size of the command packet Pct. Shd is the data size of the packet header Phd. These Nmux, Sct, Shd, and BWct are known values, and in this embodiment, are assumed to be constants for convenience of explanation.
Further, as described later, one command packet Pct is transmitted a predetermined number of times Nsc at a predetermined time interval Tnv in accordance with the DSM-CC. Since DSM-CC is defined in ISO / IEC13818-6, a detailed description thereof will be omitted in this embodiment. Nsc is a natural number of 2 or more. From the above, from the time when the command packet Pct transmitted for the first time arrives at the receiving device 2 until the time when the command packet Pct transmitted at the Nsc time arrives at the receiving device 2, it is approximated by the following equation (2). Time Ttf2.
Ttf2 ≒ Tnv × (Nsc−1) (2)
From the above, the proxy request PR needs to arrive at the broadcasting device 1 at the reference time Tref calculated by the following equation (3).
Tref = Tst− (Nsc × Ttf1 + Ttf2) −Tmg (3)
Here, Tmg is a predetermined time margin and is determined according to the design requirements of the broadcasting system BS.
If the proxy request PR arrives at the broadcasting device 1 after the reference time Tref, the broadcasting device 1 cannot transmit the command Cct Nsc times at the time interval Tnv before the broadcast start time Tst. Therefore, the proxy request PR that does not satisfy this condition includes the useless command Cct described above.
The request determining unit 12 first determines whether the proxy request PR received this time includes the useless command Cct as described above, and, based on the proxy request PR received from the request receiving unit 11, The broadcast start time Tst is extracted (step S221). Further, the request determination unit 12 receives the current time Tcr from the timer 13 (Step S222). After that, the request determination unit 12 calculates the reference time Tref by substituting the broadcast start time Tst obtained in step S221 into the above equation (3) (step S223). Thereafter, the request determination unit 12 determines whether the current time Tcr obtained in step S222 is a time later than the reference time Tref calculated in step S223 (step S224). If the determination is Yes, the request determination unit 12 considers that the proxy request PR received this time includes a useless command Cct, and passes this to the request discarding unit 14 as a proxy request PRd. The request discarding unit 14 discards the received proxy request PRd (step S23), and then passes a request rejection RR creation instruction ISrr to the request rejection creation unit 15. The request rejection creating unit 15 creates the above-described request rejection RR in response to the creation instruction ISrr from the request discarding unit 14 (step S24). The request rejection creating unit 15 passes the created request rejection RR to the request rejection transmitting unit 16. The request rejection transmission unit 16 transmits the received request rejection RR to the communication terminal device 3 currently establishing a connection via the communication line 4 (step S25, sequence Q12 in FIG. 10A).
In the communication terminal device 3, the wireless transmission / reception unit 35 receives the request rejection RR and passes it to the application execution unit 32. After the above-described step S18, the application execution unit 32 waits for a request rejection RR or a reception completion RC to be sent from the broadcasting device 1 (step S19), and receives the request rejection RR as in this case. If so, a message indicating that the proxy request PR cannot be accepted is displayed on the output device 36 (step S110). Thereby, the user of the communication terminal device 3 can know that the proxy request PR sent this time has not been accepted by the broadcasting device 1.
Here, FIG. 14 is referred to again. If the request determination unit 12 determines No in step S224, it considers that the proxy request PR received this time does not include a useless command Cct, and passes this to the request writing unit 17 as a proxy request PRp. The request writing unit 17 writes the received proxy request PRp into the request storage device 18 (Step S26). As a result, a new proxy request PRp is stored in the request storage device 18, as shown in FIG. Although the present embodiment has been described assuming that the broadcasting system BS accommodates one communication terminal device 3 and one receiving device 2, in practice, a large number of communication terminal devices 3 and receiving devices 2 are provided. Is housed. Further, the same communication terminal device 3 may transmit a plurality of proxy requests PR to the broadcast device 1 in some cases. From the above, in most cases, a plurality of proxy requests PRp are stored in the request storage device 18 as shown in FIG. When the request writing unit 18 receives the proxy request PR shown in FIG. 2B this time, the request writing unit 18 stores it as a proxy request PRp as shown at the bottom of FIG.
The request writing unit 17 further passes the reception completion RC creation instruction ISrc to the reception completion creation unit 19. The reception completion creating unit 19 creates the above-described reception completion RC in response to the creation instruction ISrc from the request writing unit 17 (Step S27). The reception completion creating unit 19 passes the created reception completion RC to the reception completion transmitting unit 110. The reception completion transmitting unit 110 transmits the received reception completion RC to the communication terminal device 3 currently establishing a connection via the communication line 4 (step S28, sequence Q13 in FIG. 10B).
In the communication terminal device 3, the wireless transmission / reception unit 35 passes the received reception completion RC to the application execution unit 32. Similarly to the above, after step S18, the application execution unit 32 waits for reception of the request rejection RR or the reception completion RC (step S19). This is displayed on the output device 36 (step S110). Thereby, the user of the communication terminal device 3 can know that the proxy request PR this time has been received by the broadcasting device 1.
FIG. 16 is a flowchart illustrating a processing procedure of the broadcasting device 1 when transmitting the proxy request PRp stored in the request storage device 18. As described above, the command fetching unit 111 periodically selects and reads Nmux information sets Icom (proxy request PRp) from the request storage device 18 (step S31). After the above reading is completed, the command fetch unit 111 passes the information set Icom to the command packet assembler 113. Further, it is assumed that the command fetch unit 111 has now read the proxy request PR shown in FIG. 2B as the information set Icom.
The command packet assembler 113 assembles the header packet Phd, and further assembles a command packet Pct from the received information set Icom (step S32). Therefore, Nmux command packets Pct are assembled. As shown in FIGS. 4A and 4B, the command packet assembler 113 outputs the header packet Phd to the multiplexer 118 first, and then sequentially outputs Nmux command packets Pct to the multiplexer 118. Output to
By the way, as described above, when the broadcast time of a certain program comes, the video data Dv and the audio data Da constituting the program to be broadcasted this time are read from the broadcast program storage device 113, and the video encoder 114 and the audio data It is output to the encoder 116. The video encoder 114 and the audio encoder 116 encode the input video data Dv and the input audio data Da, and convert the encoded video data Dcv and the encoded audio data Dca into the video packet assembler 115 and the audio packet assembler 117. Output to The video packet assembler 115 and the audio packet assembler 117 assemble some video packets Pcv and audio packets Pca from the input coded video data Dcv and the input coded audio data Dca, and output them to the multiplexer 118. I do.
The multiplexer 118 multiplexes the input video packet Pcv, the input audio packet Pca, the input header packet Phd, and the Nmux input command packets Pct to create the stream TS shown in FIGS. 5A and 5B. (Step S33), and output to the TS transmitter 119. The TS transmitter 119 puts the input stream TS on a carrier having a predetermined broadcast frequency band and sends it out to the aforementioned broadcast channel BCH (step S34, sequence Q14 in FIG. 10B).
In the broadcasting device 1, the above-described processing of FIG. 16 is repeatedly executed. As a result, as shown in FIG. 10B, a header packet Phd and Nmux command packets Pct (one in FIG. ) Will be transmitted periodically and repeatedly. Here, it should be noted that since the command fetching unit 111 performs processing in accordance with the DSM-CC, one proxy request PRp is read Nsc times at the time interval Tnv. As a result, as shown in FIG. 17, when the receiving device 2 receives the first command packet Pct (see FIG. 4B) at time T0, the receiving device 2 receives the second command packet Pct at time T0 + Tnv. Finally, at time T0 + Nsc × Tnv, the Nsc-th command packet Pct is received.
Next, with reference to the flowchart of FIG. 18, the processing of the receiving device 2 when receiving the command packet Pct transmitted from the broadcasting device 1 will be described. When going out, the user operates a switch (not shown) of the receiving device 2 to set the state of the power supply 21 to the standby state. As a result, the power supply state monitoring device 23 sends the control signal CSfa to the tuner 24 (Step S41). In response to the reception control signal CSfa, the tuner 24 sets its own reception frequency band to the designated broadcast channel BCHr stored in the designated channel storage unit 22 (Step S42). As a result, the tuner 24 receives the stream TS from the broadcasting device 1 managed by the broadcasting company to which the user has subscribed for the substitute service, and does not receive the stream TS from another broadcasting device (not shown).
Here, when the user realizes that he has forgotten to set the reservation recording of a certain broadcast program while away from home, the user operates the input device 31 of the communication terminal device 3 to specify that the proxy request program 321 is to be executed. As a result, in the communication terminal device 3, the processing shown in FIG. 11 is performed, and the proxy request PR is transmitted to the broadcasting device 1. In the broadcasting device 1, the processing of FIG. 14 is performed in response to the reception proxy request PR, and if No is determined in step S224, the command packet Pct assembled from the current proxy request PR is added to the stream TS. It is transmitted on the broadcast channel BCH in a multiplexed state. Here, it is assumed that a command packet Pct created from the proxy request PR shown in FIG. 2B is transmitted to the transmitted stream TS. Since the tuner 24 has its receiving frequency band set to the designated broadcast channel BCHr, the tuner 24 receives the stream TS transmitted by the broadcasting device 1 (step S43) and outputs it to the command packet separating unit 25. Note that the tuner 24 also outputs the received stream TS to the AV packet separation unit 217. However, when the power supply 21 is in the standby state, the drive voltage Ecc is not supplied to the AV packet separation unit 217. No processing is performed on the TS.
The command packet separating unit 25 separates each of the command packets Pct multiplexed in the input stream TS with reference to the header packet Phd (Step S44), and outputs the separated ones to the command packet decomposing unit 26. The command packet decomposing unit 26 decomposes the received command packet Pct and restores the information set Icom (Step S45). Further, the command packet decomposing unit 26 passes the restored information set Icom to the command filtering unit 29.
Each time the command filtering unit 29 receives one information set Icom, it extracts the device identifier IDrt and the password PW therefrom (step S46). Further, the command filtering unit 29 extracts the local device identifier IDrt and the local password PW described above (Step S47). Thereafter, the command filtering unit 29 determines whether or not the device identifier IDrt extracted in Step S46 matches the local device identifier IDrt extracted in Step S47 (Step S48). Further, the command filtering unit 29 determines whether or not the password PW extracted in Step S46 matches the local password PW extracted in Step S47 (Step S49). If No is determined in step S48, the command filtering unit 29 determines that the information set Icom received this time is not addressed to its own device, and discards it (step S410). If No is determined in step S49, the password PW determined by the user is not set in the current information set Icom, so the command filtering unit 29 discards this information set Icom in step S410. I do. Conversely, if YES is determined in both step S48 or S49, the command filtering unit 29 determines that the information set Icom received this time is addressed to the own device and includes the command Cct intended by the user, The command Cct is extracted and passed to the determination / writing unit 210.
Each time one determination / writing unit 210 receives one command Cct, the determination / write unit 210 performs the above-described overlap reservation determination process (step S411), and further performs the above-described capacity determination process (step S412). If YES is determined in step S411, the determination / write unit 210 determines that the command storage unit 211 stores a command Cct having a reserved time slot TPrp overlapping the reserved time slot TPrp of the command Cct received this time. . Further, if YES is determined in step S412, the determination / write unit 210 determines that there is not enough free space FS in the reserved program storage device 218. If any of the above determinations are made, the determination / write unit 210 discards the command Cct received this time, and passes the above-mentioned creation instruction ISem to the error message creation unit 213 (step S413).
The error message creation unit 213 creates an error message EM as shown in FIG. 8 in response to the creation instruction ISem (step S414). Further, the line connection unit 214 sends out the error message EM created by the error message creation unit 213 to the communication line 4 (Step S415). Here, since the error message EM is an electronic mail as described above, it is stored in a mail server (not shown) connected to the communication line 4.
FIG. 19 is a flowchart illustrating a processing procedure when the communication terminal device 3 receives the error message EM. The user operates the input device 31 of the communication terminal device 3 to instruct the execution of the mail processing program 322. Further, the user instructs to obtain the error message EM from the above mail server. In FIG. 19, the application execution unit 32 receives an error message EM stored in the mail server via the communication line 4 and the wireless transmission / reception unit 35 in response to a user's instruction (step S51). The application execution unit 32 displays the text MT of the received error message EM on the output device 36 (Step S52). As a result, the user of the communication terminal device 3 can know that the reservation recording cannot be set.
In addition, when it is determined No in both steps S411 and S412 in FIG. 18, the determination / write unit 210 gives write permission to the command Cct received this time, and writes this as a command ACct in the command storage unit 211 ( Step S416). FIG. 20 is a schematic diagram illustrating an example of the command ACct written in step S416. In FIG. 20, when write permission is given to the command Cct included in the proxy request PR shown in FIG. 2B, the command storage unit 211 stores the command ACct as illustrated.
Next, a process when the command execution unit 216 executes the command ACct stored in the command storage unit 211 will be described with reference to a flowchart of FIG. In FIG. 21, the command execution unit 216 waits for reception of the current time Tcr periodically transmitted from the timer 216 (step S61), and is stored in the command storage unit 211 every time it is received. The command ACct (see FIG. 20) is searched for an execution command ECct whose broadcast start time Tst matches the received current time Tcr (step S62). If the execution command ECct cannot be found by this search (step S63), the command execution unit 216 returns to step S61 and waits for the current time Tcr to be sent from the timer 216. Conversely, if the execution command ECct is found in step S63, the command execution unit 216 generates the above-mentioned control signal CSfb and outputs it to the tuner 24 in order to start the scheduled recording (step S64). The control signal Cson is created and output to the power supply 21 (step S65), and the above-described recording instruction ISrec is output to the AV packet separation unit 217 (step S66). As a result of the processing in step S64, the tuner 24 sets the reception frequency band to the broadcast channel BCH specified by the input control signal CSfb. As a result of the processing in step S65, the power supply 21 supplies the drive voltage Ecc to the AV packet separation unit 217. As a result of the processing in step S66, the AV packet separation unit 217 performs the operation as instructed by the recording instruction ISrec. When the scheduled recording is started as described above, the video packet Pcv and the audio packet Pca separated by the AV packet separating unit 217 start to be stored in the reserved program storage device 218.
After step S66, the command execution unit 216 waits for reception of the current time Tcr (step S67), and every time the command execution unit 216 receives it, the broadcast end time Ted set in the current execution command ECct is set to the current time. It is determined whether or not the received time coincides with the current time Tcr (step S68). If the two times Ted and Tcr do not match, the command execution unit 216 returns to step S67 and waits for the timer 216 to send the current time Tcr. Conversely, when both times Ted and Tcr match, the command execution unit 216 creates the above-described control signal CSsb and outputs it to the power supply 21 in order to end the scheduled recording (step S69). As a result of the processing in step S69, the power supply 21 transitions to the standby state, and stops supplying the driving voltage Ecc to the AV packet separating unit 217. Further, the power supply state monitoring device 23 generates the above-described control signal CSfa and outputs it to the tuner 24 when the power supply 21 has transitioned to the standby state.
As described above, according to the broadcasting system BS according to the present embodiment, the broadcasting device 1 transmits the command packet Pct assembled from the received proxy request PRp to the transport stream TS a plurality of times as shown in FIG. Since the multiplexing is performed, it is possible to realize a broadcasting system BS having a high probability that the receiving device 2 can receive the command Cct addressed to itself. Further, as described above, the command packet Pct assembled from the command Cct is mainly transmitted from the broadcasting device 1 when the user is absent (that is, when the power supply 21 is in the standby state). Further, the reception frequency band of the receiving device 2 is automatically set to the designated broadcast channel BCHr stored in the designated channel storage unit 22 when the power supply 21 enters the standby state. As described above, the receiving apparatus 2 can receive the command Cct addressed to itself with higher accuracy. Further, as described above, since the command filtering unit 29 performs the filtering process using the local device identifier IDrt, it is possible to discriminate only the one destined for itself from the information set Icom received in large numbers.
Also, the broadcast device 1 discards the proxy request PR arriving after the reference time Tref by the processing of steps S224 and S23 in FIG. 14, and by the processing of steps S224 and S26, the same as or before the reference time Tref. Accept the agency request PR that arrived at. As a result, the transmission of the command Cct included in the proxy request PRp stored in the request storage device 18 is not disturbed by the useless command Cct included in the proxy request PR, so that the receiving device can be more accurately received by the broadcast start time Tst. 2 can receive the command Cct.
In the above-described broadcasting system BS, the broadcasting device 1 has transmitted the command packet Pct having the same content Nsc times. This is to increase the probability that the receiving device 2 can correctly receive the command packet Pct. However, if the probability that the command packet Pct can be received is sufficiently high, the broadcasting device 1 may transmit the command packet Pct only once.
Further, in the above broadcasting system BS, the broadcasting device 1 and the receiving device 2 may be connected by a wired transmission line represented by a cable. Further, the receiving device 2 may receive the stream TS created by the broadcasting device 1 via a broadcasting satellite or a communication satellite. In the above-described broadcasting system BS, the broadcasting device 1 performs digital broadcasting, but may perform analog broadcasting. Further, the receiving device 2 has transmitted the error message EM to the communication terminal device 3 by e-mail, but may transmit the error message EM by other data communication. Further, the receiving device 2 may transmit the error message EM to the broadcasting device 1. Thereby, the broadcasting device 1 can recognize that the command packet Pct transmitted by itself to the receiving device 2 is not stored in the command storage unit 211 as the command Cct.
Further, in the above-described broadcasting system BS, when the communication terminal device 3 transmits one proxy request PR to the broadcasting device 1, the broadcasting device 1 sends out the command packet Pct having the same content. However, the present invention is not limited to this, and the broadcasting device 1 may transmit command packets Pct having different contents from each other in response to one reception of the proxy request PR. Broadcasters often do not broadcast a series of stories from start to finish when producing programs. Conversely, the broadcaster produces a program such that a series of stories is divided, for example, in units of one hour, and broadcast from the first to the last round to complete the series of stories. In addition, the first to last broadcasts are broadcast in the same time period on the same day of the week in principle. Such a broadcast schedule is often determined in advance. In such a situation, the broadcast device 1 sets only the date or day of the broadcast start time Tst and the broadcast end time Tnd so that all the episodes of the broadcast program specified by one proxy request PR can be reserved and recorded. May be transmitted as a different command packet Pct. Furthermore, if the broadcast schedule of the broadcast program specified in the proxy request PR is changed, the broadcast device 1 may transmit the command packet Pct in which the broadcast start time Tst and the broadcast end time Tnd have been changed. Good. As a result, the communication terminal device 3 only needs to send the proxy request PR once, so that the communication cost can be reduced.
Next, a first modified example of the receiving device 2 shown in FIG. 6 (hereinafter, referred to as a receiving device 2a) will be described. FIG. 22 is a block diagram illustrating a detailed configuration of the receiving device 2a. 22, the receiving apparatus 2a includes a dual tuner section 41 and a frequency band setting section 42 instead of the designated channel storage section 22, the power state monitoring apparatus 23, and the tuner 24, as compared with the receiving apparatus 2 of FIG. Are different. Other than that, there is no difference in configuration between the receiving devices 2a and 2. Therefore, in FIG. 22, components corresponding to those in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.
FIG. 23 is a block diagram showing a detailed configuration of the dual tuner unit 41 of FIG. In FIG. 23, the dual tuner section 41 includes an AV tuner 411 and a command tuner 412. The AV tuner 411 sets the reception frequency band to the broadcast channel BCH specified by the user operating the input device (not shown) of the reception device 2a. After that, the AV tuner 411 receives the stream TS transmitted using the set broadcast channel BCH and outputs the stream TS to the AV packet separation unit 217. The command tuner 412 sets the reception frequency band to the designated broadcast channel BCHr sent from the frequency band setting unit 42. Thereafter, the command tuner 412 always receives the stream TS transmitted using the designated broadcast channel BCHr and outputs the stream TS to the command packet separating unit 25.
The frequency band setting unit 42 typically includes a key or a button. The user or the broadcaster operates the frequency band setting unit 42 to input the designated broadcast channel BCHr. The frequency band setting unit 42 sends the input designated broadcast channel BCHr to the command tuner 412.
As described above, the provision of the command tuner 412 dedicated to the designated broadcast channel BCHr allows the receiving apparatus 2a to always receive the command packet Pct addressed to itself, regardless of whether the power supply 21 is in the standby state. As a result, the possibility of failure in receiving the command Cct addressed to itself is further reduced.
Next, a second modified example of the receiving device 2 shown in FIG. 6 (hereinafter, referred to as a receiving device 2b) will be described. FIG. 24 is a block diagram illustrating a detailed configuration of the receiving device 2b. In FIG. 24, the receiving device 2b includes a command executing unit 51 and a bus control unit 52 instead of the command executing unit 216 and the reserved program storage device 218 as compared with the receiving device 2 of FIG. The difference is that the external recording device 6 is connected via the bus 7. Other than that, there is no difference in configuration between the receiving devices 2a and 2. Therefore, in FIG. 24, components corresponding to those in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted. Note that FIG. 24 does not show some of the configurations shown in FIG. 6 for convenience of illustration.
The command execution unit 51 is different from the command execution unit 216 in the following two points. First, the command execution unit 51 sends a transfer instruction IStf to the AV packet separation unit 217 instead of the above-described recording instruction ISrec. The transfer instruction IStf is information for instructing the transfer of the video packet Pcv and the audio packet Pca separated by the AV packet separation unit 217 to the bus control unit 52. Next, in addition to the above-described processing, the command execution unit 51 transmits the target identifier TID and the recording instruction ISrec, which are assigned in advance to the external identification device 6 in order to uniquely identify the external recording device 6 described later, to the bus control unit. 52. Thereby, the command execution unit 51 instructs the external recording device 6 to transmit the video packet Pcv and the audio packet Pca output from the AV packet separation unit 217 via the bus 7.
As in the case of the AV packet separation unit 217, the drive voltage Ecc is not supplied to the bus control unit 52 when the power supply 21 is in the standby state, and the drive voltage Ecc is supplied to the bus control unit 52 when the power supply 21 is on. When the drive voltage Ecc is supplied, the bus control unit 52 responds to the recording instruction ISrec from the command execution unit 51, and firstly, from the recording instruction ISrec according to a predetermined bus protocol (for example, IEEE1394). The bus packet BPrec including the target identifier TID received at the same time is assembled and transmitted to the bus 7 connected to itself. The bus control unit 52 assembles the bus packets BPcv and BPca including the target identifier TID from the video packet Pcv and the audio packet Pca input thereafter, and sends them to the bus 7 connected thereto.
The external recording device 6 typically includes a hard disk recorder, a DVD (Digital Versatile Drive) recorder, and a VTR (Video Tape Recorder). The external recording device 6 holds the above-described target identifier TID, and includes a bus control unit 61 and a reserved program storage device 62. The bus control unit 61 executes the recording command ISrec after decomposing the bus packet BPrec received through the bus 7. More specifically, the bus controller 61 decomposes the bus packets BPcv and BPca received after the start of the execution of the recording command ISrec, and restores the video packets Pcv and the audio packets Pca. The bus control unit 61 transmits the restored video packet Pcv and audio packet Pca to the reserved program storage device 62. The reserved program storage device 62 corresponds to the reserved program storage device 218 in FIG. 6, and stores the received video packets Pcv and audio packets Pca.
Next, items set before data communication of the broadcasting system BS including the receiving device 2b according to the present variation will be described. Before the data communication according to the present variation, in addition to the above-described setting items, the user operates the input device 31 after starting the application execution unit 32 of the communication terminal device 3 to input the target identifier TID. The application execution unit 32 stores the input target identifier TID in the target identifier storage unit 37 (see FIG. 9).
Next, data communication performed in the broadcasting system BS will be described in detail. As described above, the user who notices that he has forgotten to set the scheduled recording of the scheduled broadcast program on the go operates the input device 31 of the communication terminal device 3 and specifies the proxy request program 321. In response to this designation, the application execution unit 32 starts execution of the proxy request program 321, creates a proxy request PR according to the input information of the user, and transmits the proxy request PR to the broadcasting device 1 through the communication line 4 (FIG. 10). (Sequence Q11 of (a) and (b)). Here, the proxy request PR according to the present modified example is different from the proxy request PR shown in FIGS. 2A and 2B in that the command Cct further includes the target identifier TID stored in the target identifier storage unit 37. Different.
The broadcast device 1 also performs processing according to the procedure shown in FIG. 14 when receiving the proxy request PR according to the present variation. Here, if No is determined in step S224, the proxy request PR received this time is stored in the request storage device 18, and the reception completion RC is transmitted to the communication terminal device 3 (FIG. 10B). Sequence Q13).
After that, even when the proxy device PR according to the present variation is stored, the broadcasting device 1 performs the process according to the procedure shown in FIG. Here, in step S31, the information set Icom further including the target identifier TID is read and sent to the command packet assembler 112. As a result, the TS transmitter 119 sends out the stream TS in which the command packet Pct assembled from the information set Icom as described above is multiplexed to the above-mentioned broadcast channel BCH (see the sequence Q14 in FIG. 10B). .
The receiving device 2 also performs processing according to the procedure shown in FIG. 18 when receiving the stream TS according to the present variation. Therefore, when the determination is Yes in both steps S48 and S49 and the determination is No in both steps S411 and S412, the command Cct multiplexed on the stream TS received this time is stored as a command ACct. It is stored in the unit 211.
Next, a process when the command execution unit 51 executes the command ACct stored in the command storage unit 211 will be described with reference to a flowchart of FIG. Here, FIG. 25 differs from FIG. 21 in that it further includes steps S71 and S72 instead of step S66. Since there is no difference between the two flowcharts, the steps corresponding to those in FIG. 21 are denoted by the same step numbers in FIG. 25, and the description thereof will be omitted. As in the case of the command execution unit 216, the command execution unit 51 sends the target identifier TID and the recording instruction ISrec included in the execution command ECct to the bus control unit 52 after step S65 (step S71). Thereafter, the command execution unit 51 sends the above-described transfer instruction IStf to the AV packet separation unit 217 (Step S72). As a result of step S65, the power supply 21 supplies the drive voltage Ecc not only to the AV packet separation unit 217 but also to the bus control unit 52. As a result of steps S71 and S72, the bus control unit 52 first assembles a bus packet BPrec from the target identifier TID and the recording instruction ISrec received from the command execution unit 51, and sends out the bus packet BPrec to the bus 7. After that, the bus control unit 52 assembles the bus packets BPcv and BPca from the video packet Pcv and the audio packet Pca received from the AV packet separation unit 217, and sends them to the bus 7. In the external recording device 6, the bus control unit 61 receives and disassembles the bus packet BPrec transmitted first through the bus 7, and starts executing the recording instruction ISrec. After receiving the bus packets BPcv and BPca sent thereafter, the bus control unit 61 decomposes them. The bus control unit 61 transfers and stores the video packet Pcv and the audio packet Pca restored in this way to the reserved program storage device 62. Such storage processing is performed during the reserved time period TPrp specified by the execution command ECct.
As described above, according to the receiving device 2b according to the present modification, the video packet Pcv and the audio packet Pca can be transferred to the external recording device 6 connected via the bus 7, so that the usability is further improved. .
In this modification, the receiving device 2b and the external recording device 6 are independent of each other. Therefore, the external recording device 6 cannot always execute the command Cct received by the receiving device 2b as it is, due to the difference between the manufacturers. Therefore, the command execution unit 51 may convert the received command Cct into a recording instruction ISrec having a command format adopted by the external recording device 6 and output the recording instruction ISrec to the bus control unit 52.
In addition, the receiving device 2b and the external recording device 6 according to the present modification may be connected wirelessly. Further, in this modified example, in order to know the free space FS of the reserved program storage device 62 in the capacity determination process, the determination / write unit 210 may transmit an instruction for that to the external recording device 6.
In the above description, the receiving apparatus 2, 2a, and 2b execute the scheduled recording command. However, the present invention is not limited to this. Does not matter.
Industrial applicability
The broadcasting system according to the present invention can be used for a broadcasting system capable of multiplex broadcasting in addition to video and audio.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating an overall configuration of a broadcasting system BS according to an embodiment of the present invention.
FIGS. 2A and 2B are schematic diagrams illustrating a data structure of the proxy request PR transmitted from the communication terminal device 3 of FIG.
FIG. 3 is a block diagram showing a detailed configuration of the broadcasting device 1 of FIG.
FIGS. 4A and 4B are schematic diagrams showing a series of header packets Phd and Nmux command packets Pct output from the command packet assembler 112 of FIG.
FIGS. 5A and 5B are schematic diagrams showing a transport stream TS transmitted from the TS transmitter 119 in FIG.
FIG. 6 is a block diagram showing a detailed configuration of the receiving device 2 of FIG.
FIG. 7 is a schematic diagram illustrating a command Cct that must not be stored in the command storage unit 211 of FIG.
FIG. 8 is a schematic diagram showing a data structure of the error message EM created by the error message creation unit 213 in FIG.
FIG. 9 is a block diagram showing a detailed configuration of the communication terminal device 3 of FIG.
FIGS. 10A and 10B are sequence charts showing a procedure of data communication performed in the broadcasting system BS of FIG.
FIG. 11 is a flowchart illustrating a processing procedure when the application execution unit 32 in FIG. 9 creates and transmits the proxy request PR.
FIGS. 12A and 12B are schematic diagrams illustrating an example of an image displayed in step S11 of FIG.
FIG. 13A is a schematic diagram illustrating an example of a data format of a command Cct previously held by the application execution unit 32 in FIG. 3, and FIG. 13B is a schematic diagram illustrating an example of a created command Cct. It is.
FIG. 14 is a flowchart illustrating a procedure of processing performed when the broadcast device 1 of FIG. 1 receives the proxy request PR.
FIG. 15 is a schematic diagram showing an example of the proxy request PRp stored in the request storage device 18 of FIG.
FIG. 16 is a flowchart illustrating a procedure of processing performed when the broadcast device 1 of FIG. 1 transmits the transport stream TS.
FIG. 17 is a schematic diagram showing a state in which a command packet Pct having the same contents arrives at the receiving device 2 of FIG. 1 Nsc times at a time interval Tnv.
FIG. 18 is a flowchart illustrating a procedure of processing performed when the receiving device 2 of FIG. 1 receives the transport stream TS.
FIG. 19 is a flowchart illustrating a procedure of processing performed when the communication terminal device 3 of FIG. 1 receives the error message EM.
FIG. 20 is a schematic diagram illustrating an example of the command ACct written in the command storage unit 211 by executing step S416 in FIG.
FIG. 21 is a flowchart illustrating a procedure of processing performed when the command execution unit 216 of FIG. 6 executes the command ACct stored in the command storage unit 211.
FIG. 22 is a block diagram showing a detailed configuration of a first modified example (receiving apparatus 2a) of receiving apparatus 2 in FIG.
FIG. 23 is a block diagram showing a detailed configuration of the dual tuner 41 of FIG.
FIG. 24 is a block diagram illustrating a detailed configuration of a second modified example (receiving device 2b) of receiving device 2 in FIG.
FIG. 25 is a flowchart illustrating a procedure of processing performed when the command execution unit 51 of FIG. 24 executes the command ACct stored in the command storage unit 211.
FIG. 26 is a schematic diagram showing a configuration of a conventional broadcasting system.

Claims (26)

A broadcasting system including a broadcasting device and a receiving device,
The broadcasting device,
An identifier assigned to the receiving device, a request receiving unit that receives a proxy request including at least a command to be transmitted to the receiving device,
A proxy request storage device that stores the proxy request received by the request receiving unit,
From a proxy request stored in the proxy request storage device, a command extraction unit that extracts a set of an identifier of the receiving device and a command to the receiving device,
A command packet assembler for assembling a command packet from a set of the identifier and the command extracted by the command extraction unit;
A multiplexer for creating a stream in which the command packets assembled by the command packet assembler are multiplexed;
A transmitter for transmitting the stream created by the multiplexer to a broadcast channel,
The receiving device,
A command packet separation unit that separates a command packet from a stream sent to a broadcast channel by the transmitter;
A command packet decomposing unit that decomposes the command packet separated by the command packet separating unit and restores the set of the identifier and the command of the receiving device;
A device identifier storage unit for storing an identifier of the own device,
Whether the command decomposed by the command packet decomposing unit is addressed to the own device based on the identifier of the receiving device decomposed by the command packet decomposing unit and the own device identifier stored in the device identifier storage unit. A command filtering unit for determining whether or not
A command storage unit that stores a command determined to be addressed to the own device by the command filtering unit;
A broadcast system, comprising: a command execution unit that executes a command stored in the command storage unit. A broadcasting device for broadcasting a stream to the receiving device,
An identifier assigned to the receiving device, a request receiving unit that receives a proxy request including at least a command to be transmitted to the receiving device,
A proxy request storage device that stores the proxy request received by the request receiving unit,
From a proxy request stored in the proxy request storage device, a command extraction unit that extracts a set of an identifier of the receiving device and a command to the receiving device,
A command packet assembler for assembling a command packet from a set of the identifier and the command extracted by the command extraction unit;
A multiplexer for creating a stream in which the command packets assembled by the command packet assembler are multiplexed;
A transmitter for transmitting the stream created by the multiplexer to a broadcast channel,
A broadcasting device, wherein the command extracting unit extracts a set of an identifier of the receiving device and a command to the receiving device a plurality of times from the same proxy request. The proxy request received by the request receiving unit further includes an execution start time of a command to be transmitted to the receiving device,
A request determination unit that determines whether to accept the proxy request received by the request receiving unit, using an execution start time included in the proxy request,
3. The broadcasting device according to claim 2, wherein the proxy request storage unit stores only proxy requests determined to be accepted by the request determination unit. It further includes a timer that measures the current time,
The broadcasting device according to claim 3, wherein the request determination unit further determines whether or not to accept the proxy request received by the request reception unit by further using a current time measured by the timer. The command packet assembled by the command packet assembler has a predetermined data size, and further, the multiplexer multiplexes the assembled command packet with a predetermined bandwidth,
The time interval and the number of times that the command extracting unit extracts the identifier of the receiving device and the set of commands to the receiving device from the same proxy request are predetermined.
The request determination unit,
Calculating a first time required from when one command packet is transmitted to when the command packet arrives at the receiving device, based on the data size and the bandwidth;
Calculating, based on the time interval and the number of times, a second time required from when the first command packet including the same set of the same identifier and command is assembled until the last command packet is assembled;
Based on the execution start time included in the proxy request received by the request receiving unit and the calculated first and second times, calculate a reference time at which the proxy request must arrive at the broadcasting device,
The broadcast according to claim 4, wherein when the current time measured by the timer is later than the calculated reference time, it is determined that the proxy request received by the request receiving unit is not received. apparatus. The request receiving unit receives a proxy request transmitted by an external communication terminal device,
A reception completion creating unit that creates reception completion for notifying the communication terminal device that a proxy request has been received by the request determination unit;
The broadcast device according to claim 3, further comprising: a reception completion transmission unit that transmits reception completion created by the reception completion creation unit to the communication terminal device. The request receiving unit receives a proxy request transmitted by an external communication terminal device,
A request determination unit that discards the proxy request that is determined not to be accepted by the request determination unit,
A request rejection creation unit that creates a request rejection to notify the communication terminal device that the request has been discarded by the request determination unit,
The broadcast device according to claim 3, further comprising: a request rejection transmission unit configured to transmit the request rejection created by the request rejection creation unit to the communication terminal device. A broadcast program storage unit for storing video data and audio data constituting a program broadcast from a scheduled broadcast start time to a broadcast end time,
A video encoder for coding video data stored in the broadcast program storage unit;
A video packet assembler that assembles video packets from video data encoded by the video encoder;
An audio encoder that encodes audio data stored in the broadcast program storage unit;
A voice packet assembler that assembles a voice packet from the voice data encoded by the voice encoder,
The multiplexer multiplexes the video packet assembled by the video packet assembler, the audio packet assembled by the audio packet assembler, and the command packet assembled by the command packet assembler to form a stream. Create
The substitute request received by the request receiving unit includes a reserved recording command to be transmitted to the receiving device, and a broadcast start time and a broadcast end time of a broadcast program to be reserved for recording. The broadcasting device according to the above. A receiving device for receiving a stream from a broadcasting device,
The broadcast device broadcasts a stream in which a command packet assembled from an identifier assigned to the reception device and a command to be transmitted to the reception device is multiplexed using a broadcast channel assigned in advance. And
A tuner section for receiving a stream sent through a broadcast channel,
A device identifier storage unit for storing an identifier of the own device,
A command filtering unit that determines whether an identifier multiplexed in the stream received by the tuner unit matches the identifier of the own device stored in the device identifier storage unit,
A command storage unit that stores a command multiplexed in the stream received by the tuner unit, when the command filtering unit determines that both identifiers match;
A receiving device comprising: a command execution unit that executes a command stored in the command storage unit. A power supply that takes on two states: on and standby;
A power supply state monitoring unit that monitors a state of the power supply, and sends a control signal to the tuner unit after the power supply changes from an on state to a standby state;
A designated channel storage unit for storing information indicating a broadcast channel assigned to the broadcast device as a designated broadcast channel,
The tuner unit according to claim 9, wherein in response to a control signal from the power state monitoring device, the tuner unit sets its own reception frequency band to a designated broadcast channel stored in the designated channel storage unit. The receiving device according to the above. The broadcast device uses a broadcast channel to transmit a stream in which a command packet assembled from an identifier assigned to the reception device, a password specified by a user, and a command to be transmitted to the reception device is multiplexed. Broadcast
A password storage unit for storing a password specified by the user,
The packet filtering unit further determines whether the password multiplexed in the stream received by the tuner unit matches the password stored in the password storage unit,
10. The command storage unit according to claim 9, wherein the command storage unit further stores a command multiplexed in the stream received by the tuner unit when the two passwords are determined to match by the command filtering unit. Receiving device. The packet filtering unit, when the identifier and password multiplexed in the stream received by the tuner unit match the identifier and password stored in the device identifier storage unit and the password storage unit, A determining / writing unit for receiving a command from the unit;
The receiving device according to claim 11, wherein the determination / write unit determines whether to write a command received from the packet filtering unit into the command storage unit. The broadcast device is a command packet assembled from an identifier assigned to the reception device, a password specified by a user, a command to be transmitted to the reception device, and a command execution start time and a command execution end time. Is broadcast using a broadcast channel,
The packet filtering unit, when an identifier and a password multiplexed in the stream received by the tuner unit match the identifier and the password stored in the device identifier storage unit and the password storage unit, the tuner unit Passing the command, execution start time and execution end time multiplexed to the stream received by the determination / writing unit,
The determination / writing unit is configured to, when a time overlapping with a time period from the execution start time to the execution end time of the received command is not stored in the command storage unit, receive the command, the execution start time, and the execution end time. 13. The receiving device according to claim 12, wherein a set of is stored in a command storage unit. When there is a time zone from the execution start time to the execution end time of the command received by the determination / writing unit, a set of the received command, the execution start time, and the execution end time is stored in the command storage unit. An error message creation section for creating an error message indicating that the message cannot be created,
14. The receiving device according to claim 13, further comprising: a line connection unit that sends an error message created by said error message creating unit to a communication line. The broadcasting device, in response to a request from a communication terminal device operated by a user, an identifier assigned to the receiving device, a password specified by the user, a command to be transmitted to the receiving device, A stream in which command packets assembled from the command execution start time and the execution end time are multiplexed is broadcast using a broadcast channel,
The receiving device according to claim 14, wherein the line connection unit transmits the error message created by the error message creating unit to the communication terminal device via the communication line. The receiving device according to claim 14, wherein the line connection unit transmits the error message created by the error message creating unit to the broadcasting device via the communication line. The receiving device further includes a timer that measures a current time,
The thirteenth aspect of the present invention, wherein the command execution part starts and ends the execution of the command when the current time received from the timer matches the execution start time and the execution end time stored in the command storage part. The receiving device according to the paragraph. The broadcast device broadcasts a stream in which a video packet, an audio packet, and a command packet are multiplexed using a broadcast channel,
The set of the video packet and the audio packet constitutes a program broadcast between a scheduled broadcast start time and a broadcast end time,
The command packet includes an identifier assigned to the receiving device, a password specified by a user, a scheduled recording command to be transmitted to the receiving device, a broadcast channel of a program to be scheduled for recording, and scheduled recording. Assembled from the command execution start time and execution end time,
The command storage unit includes an identifier assigned to the receiving device, a password specified by a user, a reserved recording command to be transmitted to the receiving device, a broadcast channel of a program to be reserved for recording, A set of the execution start time and the execution end time of the recording command is stored,
The receiving device,
An AV packet separation unit for separating video packets and audio packets multiplexed in the stream received by the tuner unit;
A reserved program storage unit for storing video packets and audio packets separated by the AV packet separation unit,
The command execution unit,
At the execution start time of the scheduled recording command stored in the command storage unit, generating a control signal for setting the reception frequency band of the tuner unit to a broadcast channel stored in the command storage unit, To the tuner,
After transmitting a control signal to the tuner, a recording instruction for instructing the AV packet separating unit to send the separated video packet and audio packet to the reserved program storage unit is generated. The receiving device according to claim 9, which transmits the signal. The receiving device further includes a determination / writing unit that receives, from the packet filtering unit, a reserved recording command multiplexed on the stream received by the tuner unit, a broadcast channel, and an execution start time and an execution end time. ,
The determination / writing unit is configured to, when the reserved program storage unit has a free space capable of storing a program to be reserved for recording, receive the reserved recording command, broadcast channel, execution start time, and execution time received from the packet filtering unit. 19. The receiving device according to claim 18, wherein a set of end times is written in a command storage unit. When the determining / writing unit determines that there is no free space in the reserved program storage unit, the set of the reserved recording command, the broadcast channel, the execution start time and the execution end time received from the packet filtering unit is stored in the command storage unit. An error message creating section that creates an error message that the content cannot be written to
20. The receiving device according to claim 19, further comprising: a line connection unit that sends the error message created by said error message creation unit to a communication line. The broadcast device broadcasts a stream in which video packets and audio packets are further multiplexed using a broadcast channel,
The set of the video packet and the audio packet constitutes a program broadcast between a scheduled broadcast start time and a broadcast end time,
The tuner section,
An AV packet tuner for setting its own reception frequency band to a broadcast channel specified by a user;
A command packet tuner for setting its own receiving frequency band to a broadcast channel used to broadcast a command packet addressed to itself.
The receiving device,
An AV packet separating unit that separates a video packet and an audio packet from a stream received by the AV packet tuner;
The receiving device according to claim 9, further comprising: a command packet separating unit configured to separate a command packet from a stream received by the command packet tuner. The broadcast device broadcasts a stream in which a video packet, an audio packet, and a command packet are multiplexed using a broadcast channel,
The set of the video packet and the audio packet constitutes a program broadcast between a scheduled broadcast start time and a broadcast end time,
The command packet includes an identifier assigned to the receiving device, a password specified by a user, a scheduled recording command to be transmitted to the receiving device, a broadcast channel of a program to be scheduled for recording, and scheduled recording. Assembled from the command execution start time and execution end time,
The command storage unit includes an identifier assigned to the receiving device, a password specified by a user, a reserved recording command to be transmitted to the receiving device, a broadcast channel of a program to be reserved for recording, A set of the execution start time and the execution end time of the recording command is stored,
The receiving device,
Connected to an external recording device via a transmission line,
An AV packet separation unit for separating video packets and audio packets multiplexed in the stream received by the tuner unit;
A bus control unit that transmits the video packet and the audio packet separated by the AV packet separation unit to the external recording device through the bus.
The command execution unit,
At the execution start time of the scheduled recording command stored in the command storage unit, generating a control signal for setting the reception frequency band of the tuner unit to a broadcast channel stored in the command storage unit, To the tuner,
After transmitting a control signal to the tuner, a transfer instruction for instructing to transfer the video packet and the audio packet separated by the AV packet separating unit to the external recording device is generated and transmitted to the bus control unit. 10. The receiving device according to claim 9, wherein: 23. The method according to claim 22, wherein the command execution unit further converts the scheduled recording command stored in the command storage unit into a format executable by the external recording device and sends the command to the bus control unit. The receiving device according to the above. A method for broadcasting a stream from a broadcasting device to a receiving device,
The broadcasting device,
An identifier assigned to the receiving device, a request receiving step of receiving a proxy request including at least a command to be transmitted to the receiving device,
A proxy request storing step of storing the proxy request received in the request receiving step,
From the proxy request stored in the proxy request storing step, a command extracting step of extracting a set of an identifier of the receiving device and a command to the receiving device,
A command packet assembling step of assembling a command packet from the combination of the identifier and the command extracted in the command extracting step;
A multiplexing step of creating a stream in which the command packets assembled in the command packet assembling step are multiplexed;
Transmitting the stream created in the multiplexing step to a broadcast channel,
The receiving device,
A command packet separating step of separating a command packet from a stream transmitted to a broadcast channel in the transmitting step;
A command packet decomposing step of decomposing the command packet separated in the command packet separating step and restoring a set of the identifier and the command of the receiving device;
The command decomposed in the command packet decomposing step is addressed to the own device based on the identifier of the receiving device decomposed in the command packet decomposing step and the own device identifier stored in the receiving device in advance. A command filtering step of determining whether or not
A command execution step of executing a command determined to be addressed to the own device in the command filtering step. A broadcasting method for broadcasting a stream to the receiving device,
An identifier assigned to the receiving device, a request receiving step of receiving a proxy request including at least a command to be transmitted to the receiving device,
A proxy request storing step of storing the proxy request received in the request receiving step,
From the proxy request stored in the proxy request storing step, a command extracting step of extracting a set of an identifier of the receiving device and a command to the receiving device,
A command packet assembling step of assembling a command packet from the combination of the identifier and the command extracted in the command extracting step;
A multiplexing step of creating a stream in which the command packets assembled in the command packet assembling step are multiplexed;
Transmitting the stream created in the multiplexing step to a broadcast channel,
The broadcasting method, wherein the command fetching step fetches a set of an identifier of the receiving device and a command to the receiving device a plurality of times from the same proxy request. A method for receiving a stream from a broadcasting device by a receiving device,
The broadcast device broadcasts a stream in which a command packet assembled from an identifier assigned to the reception device and a command to be transmitted to the reception device is multiplexed using a broadcast channel assigned in advance. And
A receiving step of receiving a stream sent through a broadcast channel;
A command filtering step of determining whether an identifier multiplexed in the stream received in the receiving step matches an identifier of the own apparatus stored in the receiving apparatus in advance,
A command storing step of storing a command multiplexed in the stream received in the receiving step, when it is determined that both identifiers match by the command filtering step,
A command execution step of executing the command stored in the command storage step.

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